Search the internet for best SD ammo. The #1 answer in 9mm is Cor-Bon 115gr JHP. It is +P with 1350fps and 466ft lbs energy. That is what I use for carry. Most SD ammo is in the 1000-1100fps range with 350-400ft lbs.energy. I've use that ammo in my 16 ounce LC9. It gives a very little extra flip, but not bad. I can easily get back on target fast. You want the best for SD. All Cor-Bon ammo meets SAAMI specs.

I just got my Shield 40 and have ordered Cor-Bon 40 S&W 135gr JHP with 1325fps and 526ft lbs energy. Not a lot of local gun shops stock Cor-Bon. I order it from ammunitiontogo.com. They have good prices and delivery charges are reasonable. I also us Cor-Bon SD ammo in my XD45.

Bob